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Off-axis negative branch unstable resonator in rectangular geometry

Pargmann, Carsten and Hall, Thomas and Duschek, Frank and Grünewald, Karin and Handke, Jürgen (2010) Off-axis negative branch unstable resonator in rectangular geometry. Applied optics, 50 (1), pp. 11-16. Optical Society of America.

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The application of an off-axis negative branch unstable resonator to an active medium of rectangular geometry is examined. The presented unstable resonator consists of spherical mirrors and a scraper mirror. The adaptation to the rectangular cross-section is performed by the scraper, which takes two different shapes. One shape resembles to a rectangular bracket "[" and an other to the letter "L". The [- and L-configurations correspond to a shift of the optical axis away from the center of the cross-section, towards one of the edges or towards one of the corners, respectively. Both scraper setups are examined numerically and experimentally. Experiments are performed with a multi kW class chemical oxygen iodine laser. The active medium is characterized by a low amplification coefficient. Measured results of the intensity distribution in the far field and of the phase distribution in the near field are shown for both resonator configurations. Using the same resonator magnification, the setup with the L-shaped scraper has a lower output coupling and therefore a higher output power and a slightly higher beam divergence. The L-shaped scraper configuration is able to cover the gain medium completely.

Document Type:Article
Title:Off-axis negative branch unstable resonator in rectangular geometry
AuthorsInstitution or Email of Authors
Pargmann, Carstencarsten.pargmann@dlr.de
Hall, Thomasthomas.hall@dlr.de
Duschek, FrankFrank.Duschek@dlr.de
Grünewald, Karinkarin.gruenewald@dlr.de
Handke, Jürgenjuergen.handke@dlr.de
Date:21 December 2010
Journal or Publication Title:Applied optics
Refereed publication:Yes
In ISI Web of Science:No
Page Range:pp. 11-16
Publisher:Optical Society of America
Series Name:Applied Optics
Keywords:optischer Resonator, chemischer Laser, instabiler Resonator, Strahlqualität
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Laser Research and Technology (old)
Location: Lampoldshausen
Institutes and Institutions:Institute of Technical Physics
Deposited By: Carsten Pargmann
Deposited On:04 Aug 2010 22:20
Last Modified:25 Nov 2015 05:03

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